14 
CONTRIBUTIONS TO BOTANY. 
and irregular on the margin. I can only account for the exist- 
ence of these two outer cups, by supposing them to be merely 
external involucrating cupuliform bracts, now made manifest by 
the lengthening of the pedicel, and that have become enlarged in 
the same manner as the calyx, and which have formed part of 
the original gemma, out of which the clustered fascicle of almost 
sessile lowers springs ; for in my flowering specimens, although 
these bracts are very short and almost obsolete, they are yet 
distinctly cupuliform. I have formed the generic name from 
KaOeBpa, sella, on account of the petals and stamens being sup- 
ported on the margin of an elevated cupuliform disk. 
Cathedra (gen. nov.). — Calyx cupuliformis, carnosus, margine 
membranaceo-ciliatus, obsolete 6-dentatus, liber, persistens. 
Petala 6, oblonga, acuta, intus ad apicem subtrigona, carnosa, 
et glandulis brevibus sub-piliformibus creberrimis tecta, ad 
medium fasciculo setarum barbata, et ad imum subcompressa, 
truncata et simul cum staminibus puncto ad marginem disci 
singulatim inserta, erecta, sestivatione valvata. Stamina 6, 
petalis opposita, et us dimidio breviora; filamenta brevissima, 
lata, crassiuscula ; antherce apicifixse, subconicee, subtetragonese, 
subgibbse, imo cordatie, apice mucrone obtuso signatse, 4-locu- 
lares (summo poris 4 tegmine subdeliquescente bine clatbrato 
pro emissione pollinis vix apertse ?), areolato-crystallinse, e cel- 
lulis elongatis circa loculos transversim radiantibus formatse, 
facie externa bine reticulato-bullatse. Pollen ovatum, can- 
cellato-reticulatum. Discus bypogynus, cupuliformis, car- 
nosus, integer, calycis longitudine, utrinque omnino liber. 
Ovarium liberum, substipitatum, dimidio inferiori obconico 
glabro, dimidio superiori glandula carnosa depresso-conica 
radiis 12 notata pilosula coronato; imo 2-loculare, summo 
1-loculare, 2-ovulatum, ovulo anatropo in loculum singulum 
incompletum apice placentae axillaris utrinque pendulo. Stylus 
brevis, erectus. Stigma oblongum, obcordato-conicum. Fructus 
ignotus. — Arbusculus Brasiliensis, ramulis subflexuosis, cortice 
rimoso, rubente ; folia alterna, elliptica, coriacea, breviter petio- 
lata, exstipulata ; flores plurimi, parvi, e gemma axillari imbri- 
cati, aggregati, fere sessiles, glanduloso-tomentosi. 
1. Cathedra rubricaulis •, — ramis nodosis, subflexuosis, rugosis, 
ramuhs cortice rubro nitido rimoso deciduo vestitis ; foliis lan- 
ceolato-oblongis, acuminatis, coriaceis, divaricatis, utrinque 
glaberrimis, subtus pallidioribus, margine revoluto, petiolo 
subbrevi, crassiusculo, canaliculato ; fasciculo axillari, 10-12- 
flori, floribus creberrime aggregatis. — Rio de Janeiro ad mon- 
tem Corcovado, v, v. 
